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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3fb1730391a93b3326f1692758878fc7e353f325e3aba623e85cfd57f9b058' 
  AND token = 'xpDyDtluWT6+DON77KlqMn4PtDr6SZtEEbUeTAgR4og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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