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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299ffae26a7621e10afb3748383d726805e1b1a336222db180c794d978685ffe' 
  AND token = 'BgTfbIZDKo3LoLnoi5G59iltypKuj3LGZAt6RDrBpPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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