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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d988e024673e513d70fa08a2d50bd04d934a9a6a5fe9244b57e0d8aa9d9728a' 
  AND token = 'oRjS3uynCvMD399xHW7LrLT1m9gOCqsz7yd1eyn+Has=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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