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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561380c9e867a842f23b5c8c767c7630b38aba0f8427750c7f178ab8ca32fe84' 
  AND token = '7Pfd67o3BONZMp7ikoR8KZJcpLaRnTpZ+0D2ntCwSiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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