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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b60636d35cd808b6f85ef5dfb8c69c6db2251da8e48d22439ee118620d7137' 
  AND token = '6rJ5EnVO+vIkifMQUNWU/iEVzSXVi6uG5PMUfHAnD4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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