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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b05fd875d454c8383372fcb6fc0d069e04f865c38a31ac77a0ab82f7bc9d91' 
  AND token = 'tCoX66fntAdHRybEf68rNUTrMkU8s6Y3JZMpJDocE7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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