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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a999d0976b82599e77afed34b723a4fc6ee9bb72280e4d893cdc04da9724f0' 
  AND token = 'CLDE8JnYyxL0MdmHpp2zz0mQiZptxaj3sx/rFg02enE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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