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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90385313205ddb0fe89fef988504944418c878f6a4bec2e05b98a799fd35d8a2' 
  AND token = 'qnr9ZaDRtzmaUl3lYYEguzikOGJB8XZVDyUm6kTXakk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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