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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8660aa53f844cb9c0ed05ac12277a584652303d8e58c8c05743a7f8685043dbd' 
  AND token = 'no6XrfXalWahD5DrnxfgwKS/E3uivvv+5os6blSTmvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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