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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c54816ecea2a98e827e2f57fee43cad8bf8a7129be4f4b85382868fb526db9' 
  AND token = 'of/ffhO8fKcUu8J9kr1zbNTDJDWgqpnDgmviI+a4uEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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