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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b1627db310901961418eb22bf7b1b93121e24916e2a9d65f0f603414d1e8cf' 
  AND token = 'lJk1yOMj1esUe+B6/ahryLyLF+M7JRGcoJamwCFiCQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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