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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e42a63e955ba4049a24b588e29e1ebd1332d8eb14498f33fb0568a56dcaa5f' 
  AND token = '3HoeB9Cbcs91ZpCmPj0a7YP+lJalMJhVh5snSB2VRZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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