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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd589d6a4b18b8bf642b4d9e9ef0b21ad9bb5568ada746df1cd7cd3675b4b03b3' 
  AND token = 'KVUjo4FQ6t9kpmv1zrKRTAnaknPb3KN4PR8PYJPh1lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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