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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90771b9d021bc5e5a75fdb862acf3f1aa152701f3665072ec533df080025ac6d' 
  AND token = 'CwF8aprh8yh4y6932Fg7//ftRG7lcIVqAOthEBOewAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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