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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36055c5b98ee3d54cf7b1da2c45e6acad1f1bdf393708ec4a0576ec6a59b2745' 
  AND token = 'gbamSe7JfmvBzGMl0bajV18SnWjfIoqYXb4+Wi/TndI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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