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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1eaabb587505fe9f4696e2adbafe0b5bf0d843c86c7b3065233e644eda2d76e' 
  AND token = 'PPv1mLe9AB7cyEVohoMobbHOFH0X2hd1Msqlm88R+7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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