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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2211ad5656df7d93d45f89c83a841f2cfab59265760200bce388ab0646f7bae' 
  AND token = '8HVDlLcJoT89uof5y92dcfsJKavxhfQ5RyqWUKTchKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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