SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f0ff440a82a76654c7f8521be276626d658324fb83d79b18efcc8af1a27085' 
  AND token = 'gDgrHF+2aSUG8tGWmsQlv4xH7GGvYjsOWaLuiACqy4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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