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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c96df2bf635309dc7867213ce5295ea67f2fe56cae11c76319fdb8d28723b07' 
  AND token = 'AyTXE9OlJ0CHic/2d2ppiIuEiMyQ5jgTB5vchDT4B6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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