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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7af8c7bc2a48fb01571b59e0afd7331d3dcc244d0584dc398c3877fe860cf5e' 
  AND token = 'ngAd/IrcYqUZ145QqJJ3LtWPmkjH6WOkT7s3Woz6egQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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