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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e6b68253252074162034dfe0b8ada07cf716b95551af198556761f8d5254d7' 
  AND token = 'mRO25JDJistX7edgt2+6w3QDQ9fjXLuKVdhIpPh2g78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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