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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72628e4f445f0a4e02caac2325e141d0a631457a7bb8b64a39b2e2964e19d71' 
  AND token = '/eJU3yxhK06cmXoNBrFyP5uBaDX8yCf7ZQArkuwY8H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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