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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc335f67f9a451df40dbff1b3626ecb5ff2ebe8f9c7cdc7bff7d274f35005f5' 
  AND token = '/yHTZOnemzNb/QIv3X9FPsibtvw2YEaTRhYK64wii30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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