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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f8794b163e0c08cdcf6a39f2e900eac968a1fb9ce255e458efccc8d2289624' 
  AND token = 'BakHRqcrLqyNBo+j/1ErL9rxkcaywqTp9gFMD81mRWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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