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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2432a304e3eaf9aa1a6d756c8f556ad0bba247bde6d6602adaf75258f4ead9e0' 
  AND token = 'l07eR8FxJylC0oy65WmJoQ5LcHeCP9lHM1GkLlgOIEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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