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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba1042a9a1d1eca19680b66a54b0897125592321ff666a7d20cfe5e22662014' 
  AND token = '3EuYBhZQGEHDYdBD96uAAwWuOHaxD6/5vU/guso/Rtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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