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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dd5acb784b981ffe8a4f0a3ae5f2216c634c1dcc54e95264e62da4c4a9d1c2' 
  AND token = '2CBq89J1Xdz8gJN6YcoUw+vOrEB6ClyE67BZiOE14ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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