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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36200f1d9394061d1cd60d351dc923a78190577babae6b1bed39d8578d110ef0' 
  AND token = '17Epst9EHl8j0Ll5CKy7RPS72+1eTOpjPqTz/U7/eSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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