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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403a04c515c133f29dcd0a1d9626aef2717260fa535d97cb21aa1f959544c416' 
  AND token = 'ZNPcIQrbZevncjCIhMwJDtn3fWtp5s3MS0vuUJQfnmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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