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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebc32fcdb56f2fb507b464b22749330586cc28af254ee2d462f7a87ad396128' 
  AND token = 'FTgysshTU5Zk2sRWu2ocG5XPDpB5dBiHjlUaoDcOcTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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