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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91807b10df4b649ca221d33aa2a0b90e62a3765fb81baef79d2783fcc30ead4' 
  AND token = 'ao380V3UHXd8TiDj6pqVZH/Pu9c1ohyu/5N5lXD6ug4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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