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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b921b1a69d60611106dbba18941269234df9d93cf1ca235463fcfeacc32bf8c' 
  AND token = 'TSnClYW2W2wdVclSMEwoUWqFi/7xq5HzTMrhFjqjp2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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