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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4690fab2dd03eb366cb57169cd7ca5b701f7928c17685a3663e968e3ac80390b' 
  AND token = 'RcQToPx8OjHVHYexMiBgF49qXBaMTNQSSnG0B71LLtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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