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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530d801b7663ec3b382b1c5018e6a4b78a7a564f75d6d3152918cf80aad8526e' 
  AND token = 'up7vFB5GuVeYGh3L/RzAuEWXExaegkySKx0Kq3p9EqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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