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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63931c692a81b75c1e3231f3980ec370e4ee99c8080333f37a688955c412573' 
  AND token = 'rYKT4MQHaULUEvS8AvvbALKxGqwbSk3paxDBsOHJn00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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