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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee34efb2eacd9ebb1c7c783b31d297ca76ce12917bccfd62dafa75acf8f9610' 
  AND token = 'AyfCuz1yaF3DRwT1rxEpxty061xjeTD0VJOYC+ewhe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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