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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a9032886c15728b8822742a1dd2ac291929d7017b5009cbb6e79b467b95f87' 
  AND token = '4NKxfp5riia3HVI5KU6gcdqpYXEJ4/Nx2OeRhnExOAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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