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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d90fc1930efa846902fb50d6ad6b4f3c99714d0b746157cb4241fc55f35d26' 
  AND token = 'scp2wvexd0tQ0ytGJz4pZJGEV3oL4FwEtLPZpmQm/Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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