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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234a82d015748f6633e239e2fb686186d2230e9b777d0974d36970181270b622' 
  AND token = 'XFDkan1w46BCK55S2oJmGnu6RjoI/X32coiUI70Q6sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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