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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3033d81d60ac297f8627396b2f173d081f2619eef877fbf291d745ecbb76c23f' 
  AND token = 'ipH9JmZNAmPUpweetElbQysMUBdy4WhWG6OTIz74+v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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