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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ad7c78a9b8cf3e22570b933cd16976d20fcc92088d50ab417f1ac1ea00e854' 
  AND token = 'k3kpW0hdg1PoEQHYgUGXPl6PDY4UweIuti0IE5UApc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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