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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d7fd1b45cf5398867dfed99b9f3b61c758ca816b502870b5999599660d474f' 
  AND token = 'Qb079cy0M2j8UQm/C2aYbZHgtdGCBCYqxRqNn9/8aMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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