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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f032311b0c38a4dd599f82208729214bb68e9f28aaf0dd4e911cf4995c1afa' 
  AND token = 'hiYBTG8LD7ygEz+kj/9ioeaHKDy6xe2ku/enx9wlhFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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