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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876ab5e16163b64ca33690c3354fce88d078bd86148dbae160117e59cf967541' 
  AND token = 'kyI9Aj/TTz9LuAknCBFF9M0b+27T/3EdZoRksVKTSm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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