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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c88004e30efc7944a54d3bde8585fca983dba2c169fe9e21fd57999161b694' 
  AND token = '3h43P7up+Sjcxq879EcqcInjCzQoR4fagDH0fV5FRxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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