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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3610876ee97a44a253f1f934bbf088c97a16e78fb0e897d36c9927944534d8a3' 
  AND token = 'eGaTXW2JXD7+2ZXu8E3+a3YxgKXVUd4oZQUV/e06a0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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