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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8b3c2ba42bfa937a9a9f3d3e9c840ad8612358ebbd31e26bb0a76ca5a0168d' 
  AND token = 'aNx6f4VWl1OJ9w0JgAexZBMOhzqXeb6GOGugZCljeAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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