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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9442d8c3ac336a3e2d0187df00f8ca210d6dca6633d2442029edadead813c4c5' 
  AND token = 'wyN9KkAiOso3TrBOpbIbs3MleNkkYYqtlYKZMQCZh6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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