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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba5875faa8a1f9ad75a9e123393f6f06050424d23b28cc58799001a2a9a8dab' 
  AND token = 'MFzgEpPsmsgNEQjHolvMWW5XHW0MLzu8jw/sBfp+f8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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