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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6277f4f9b44565dc91fea33a0a0e416f904fbe01bdeeadd8b4bca4bfd3eec6ec' 
  AND token = 'L8SYSzf+DMllGaifLT4Tf6AqWnF2y3CuXJ/Jx+N7flI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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