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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff2bb4fb6f4c8ce9b97490c875fb5dde77c00e1a2927b01dbd2bb10acab2588' 
  AND token = 'ADUWcW/hoPUhDWhQcgCi1PeSnCVddmJDhzt9qlsPfh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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