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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e819e2298b068bed7359a7cc92c21e95384a9c98d74ed47e24693a8604003158' 
  AND token = '7mccR0M8ajhee5gr4loA2m8fwKXs0CHXqpiwmg0yCqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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