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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9642743a7deaa47d10d51b5b71752ff96104e674b3a865c2dfe527f9fe96de01' 
  AND token = 'GPNAsKfRyKanahn/56Zu19gciO5u9prXpYx9ly0h4eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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