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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42d58dd2d1041aa24253e5b1ece1a6bc7fc85cc6a1d99683160c5d3ad0c1dda' 
  AND token = 'Vroq+HIGXsSpe69nkOrpcMvyWb7ObxNFQr2YTTPoVaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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