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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552a90622d2328eb431300bb79b0123a449e939cafc18c5f56fb3907eceb2d35' 
  AND token = '3gQRiTP9WSfnxMYZR9rQ/cMp7ocoVLgVGGlV72p422A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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