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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7605738f25d2fdffbe406f725c148f6a5dd724fd421257b95dff8aa7bcfa24' 
  AND token = 'X8rZa20iPXPeG/ntyf8W0g8FDxewMM5SEAn10Yo8W+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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