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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcdbe352484e8eb9d160afbb99038457066f411176db7c0ac4129c9e9566206' 
  AND token = 'JH6zdkfLRYBvvPQ2Ck4tHl1R2eRh8e7RI9Jh8k3V1xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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