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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd7616ff62f73daa9a897c47ff082525a6c6f73abeca084664a50df6187e957' 
  AND token = 'SXfRbkpY8mRRXLmfqzRVyXZTx2BJYDm8ypqNMsA++MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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