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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b507397100914bd6908fb98ef5f8fde59d19c34fc71d27236d5662552c0f440' 
  AND token = 'dI7P4myN9sYSHyfbgBMio4IvpGAA+Sm6/FpgzSfQeeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}