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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bf756f4fdc988e8f53fce580edb83180f169e7e2c92ae8c076419370b7d43a' 
  AND token = 'AETWVngN5hOo1KDrwI3kAQ8NhcBXtXuBsLV5S7fFbXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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