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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf381fc1802559fac8afe90f20efd34b30b829ba8010905a17a2816009ca8703' 
  AND token = 'pXuyKH7IR91DnTM8ghIh2y7J7aDiNeTHcqtZqe3bMmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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