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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9251824856093439f54544c9083dbca569f6b7f01df087b3548e2a439d3f1430' 
  AND token = 'aZpkqiZTi6xQmgTu5FFW3tX3GyR1OQnMG58pUxiY0rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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