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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb2507410c4c417ceaa5d92544be4501cfb2567d4b34b117075482c8f63c68a' 
  AND token = 'ZhBKY+KI+V8bSQC6oL46xwrMkhfp3qlZHJKkrba7ReA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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