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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb888c63d656a77bc96e14653f9b66a076eb7e48e217e97c4e42022b47be19e' 
  AND token = 'dvGy4hvXl5SDevd2sNsVw7YBjKTQnkslSoiufPGm7aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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