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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d1405e9d7700d90afa57c287d4b05483cda34c3ae6d0902d05287c3324e28e' 
  AND token = 'XBFxmFkfmJtBnXIXrGVSKMLIsLxyaOqkh3X506t8j3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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