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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ac090bd658788179fe43e5567e2589da76e6d2c6b096374d05211432b21e80' 
  AND token = 'HAoFm7ukd8+mA1d2By40HAUbYQwOwD1887EtTBfPIlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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