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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f1500744b6f1a94ad9af29f0b9ee2bb2e8007a47017383f7fce37087953bd6' 
  AND token = 'YV0txlZBabJJo2Pry5LwBVvNs2e5OgipxoZwCBrKlKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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