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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd58b924e7f8414aa33a26e430fe57c068bd38b7663d9962cee5c28ff8e89686' 
  AND token = '9ra3kK2LPSiEAdziUYdjACwVgeh6JcGlLA216R0nQjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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