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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc23261194d2e6c4d074b04851e0e6e327a2e5f6030aef3b66ff704f31b4cf8' 
  AND token = 'YlAvZI//8z8le8An0rNOGw8CEcsNCtr+l1bHMXHDv84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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