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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4704f9bc79de270068042560f7de574bdb38592d7fd7b6efc852f39a9c3bf65c' 
  AND token = 'amL9SMORtXZAKK/k0PFJbFZq3tTYX0E1wMi6CaDnUsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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